The rabbit's long ears, which can be more than 10 cm (4 in) long, are probably an adaptation for detecting predators. They have large, powerful hind legs. The two front paws have 5 toes, the extra called the dewclaw.
However, Moorish idol larvae spend a long time drifting through the open ocean before they mature, so regional populations donât remain isolated enough to develop particular traits. Because of its beauty and its identity as a quintessential reef fish, the Moorish idol is a very popular fish in the aquarium trade.
The Garfish is a great example of a living fossil that has been in North American waters for the last 50 Million Years! It is almost unchanged since the days that it lived in those prehistoric swamps. This primitive fish has been able to survive all that time. It has a long and slender body with a long snout. Its long jaws have needle like teeth.